Then, there is the very simple and obvious fact that the photographer, whoever she was, missed centering the Kennedys in the picture by a lot.
It's understandable and explainable that Babushka Lady missed centering them by that much because she shot her picture from a diagonal, and it's hard to do. But, Mary Moorman shot her picture perpendicularly (from straight across) for which it would have been easy as pie to get them centered. It's ridiculously easy; you just wait until the subjects are in front of you, and then you snap the picture. So, Mary Moorman could not have missed by that much. If she wanted to point her camera at the Kennedys, she would have pointed it at them. And she most definitely wanted to point her camera at the Kennedys.